New K borides and related phases (filled up Re$sub 3$B phases)

Journal Article · Mon Jan 01 00:00:00 EST 1973 · Monatsh. Chem., v. 104, no. 1, pp. 182-193

OSTI ID:4401709

Rogl, R; Nowotny, H; Benesovsky, F

The crystal structure of the kappa Hf --Mo--B phase was refined by means of Weissenberg photographs; the position 2a (P6/sub 3/mmc) is occupied by Mo atoms, not B atoms. Thus, structural identity with Co/sub 2/Al/sub 5/; and Mn/ sub 3/Al/sub 10/ is obvious. The analogous K borides Zr/sub 9/Mo/sub 4/B (it forms complete solid solutions with W/sub 9/Mo/sub 4/B) and Zr/sub 9/W/sub 4 /B also exist. Hf/sub 9/Mo/sub 4/B dissolves Al up to 14 at.% (1400 deg C). Further compounds with the above-mentioned structural type (K phases) were detected within the systems Zr--Mo-- {Fe, Co, Ni} and W--Mo(W) -{Fe, Co, Ni}; the iron metal atoms occupy the boron positions. Phases with composition Zr/sub 3/ {Fe, Co, Ni} (N, O)/sub x/,, obtained by sintering, belong to the filled-up Re/ sub 3/B-type structure. (auth)

• Research Organization: Univ., Vienna
• NSA Number: NSA-29-010615
• OSTI ID: 4401709
• Journal Information: Monatsh. Chem., v. 104, no. 1, pp. 182-193, Other Information: Orig. Receipt Date: 30-JUN-74
• Country of Publication: Country unknown/Code not available
• Language: German

Related Subjects

N50130* -Metals
Ceramics
& Other Materials-Ceramics & Cermets-Properties
Structure & Phase Studies
*COBALT BORIDES- CRYSTAL STRUCTURE
*HAFNIUM BORIDES- CRYSTAL STRUCTURE
*IRON BORIDES- CRYSTAL STRUCTURE
*MOLYBDENUM BORIDES- CRYSTAL STRUCTURE
*NICKEL BORIDES- CRYSTAL STRUCTURE
*TUNGSTEN BORIDES- CRYSTAL STRUCTURE
*ZIRCONIUM BORIDES- CRYSTAL STRUCTURE